Magnetic separator.



. IVI. FOLSOIVI.

MAGNETIC SEPARATOR.

APPLICATION FILED MAR.10.1915.

Patented Nov. 23, 191V.

a /6 @oy e/ ROBERT M. FOLSOM, OF READING, MSSACHUSETTS, SSIGNOR 'lO NEWENGLAND GAS & COKE COMPANY.

MAGNETIC SEPARATUR.

' Specification of Letters Patent.

Patented Nov.. 23, 1915.

Application filed March 10, 1915. Serial No. 13,1171.

his invention relates to magnetic separators, and is more especially,though not exclusively, concerned with a separator for causing theremoval of iron and steel objects, such as bolts, spikes and the like,from coal which is being fed to a breaker, whereby the latter isprotected from injury which would be likely to occur, if it were not forthe provision of the magnetic separator in connection therewith.

My invention will be best understood by reference to the followingspecification, when taken in connection with the accompanying drawingsof one specific embodiment thereof, while its scope will be moreparticularly pointed out in the appended claims.

ln the drawings: Figure 'l is a cross-sectional view of a -magneticseparator embodying my invention, the hopper and breaker casing beingpartly broken away; and Fig. 2 is an elevation of the same, with aportion of the hopper and a portion of the cylinder in centrallongitudinal section the supporting frame-work being omitted.

Referring to the drawings, and to the embodiment of my invention which lhave selected for illustration, I have there shown a .magnetic separatorcomprising means for creating a suitable magnetic field, the samecomprising one or more, herein a plurality of, magnets 3, hereinelectromagnets, having appropriate windings for, and provided with leadwires 5, which in practice will be lconnected to the pole pieces of asuitable into the magnetic field may be regulated.

The materials gravitating from the outlet of the hopper may be deliveredonto a suitable surface, such for example as a traveling surface 9,herein the circumferential surface or periphery of a hollow,

non-magnetic cylinder or drum 10, which forms a convenient housing forthe electromagnets 3. The latter may be sup orted by any appropriatemeans, but erein are provided with split collar pieces 11, encirclingand clamped about a fixed hollow shaft 12, by means of clamping bolts13, whereby they are held fixed in definite positions of adjustment.This shaft is made hollow to constitute a convenient conduit for thelead wires 5, the circumferential wall of the hollow shaft for thispurpose being provided with a series of perforations 14, through whichthe lead wires extend from the electromagnets to the interior of theconduit.

As the coal or other material is deliveredl onto the cylinder 9, it willnaturally gravitate to .a point therebelow. The magnetizable objects,however, will be attracted by the magnet or magnets, and will tend toremain within the field of the latter. Each of the magnets, as hereinshown, is provided with a generally segmental'pole piece 15, which, asherein shown, is approximately ninety degrees in extent. rl`he lines offorce of the magnet will naturally extend a considerable distancecircumferentially beyond the ends of this pole piece, and when theextent of the latter is as shown in the drawing, the effective field ofthe magnet includes about forty per cent. of the area of the drum, itsextent being indicated by the lngth of the are A. lt must be evident,however, that the magnetizable objects would naturally tend to remainwithin the field' of the magnet, were it not for the provision ofsuitable means to cause them to be carried out of the field. Whilethismight be accomplished by other means, I have herein provided a movablemagnetizable body 16, preferably composed of soft iron, and having apath of movement into and out of the magnetic field, whereby the lattermay be extended intermittently in the general direction of travel of thematerials. Preferably, this body is caused to revolve about the axis ofthe drum 10, so that it will enter the magnetic eld at the upper portionof the latter, and leave it at the lower portion. As a con- 'iso venientmeans for imparting the desired rotation to the magnetizable body 1`6,the same is herein secured to the drum 10, and the latter 1s mounted forrotation upon the shaft 11. The terminal portions of the shaft aresecured to a suitable frame 17, whereby the drum is supported, and thelatter receives its rotation from a pulley 18, secured to the drum anddriven by a belt 19. Preferably, the magnetizable body 16 is induplicate, as

- shown in Fig. 2, although this is not essenalthough it will naturallytend to be carried Y along somewhat in the general direction of therotation of the drum 10. When, however, the advancing edges 21 of themagnetizable bodies 16 encounter the magnetizable object or objects,they will carry the latter along. It should here be observed that themagnetizable bodies 16 are provided with rear portions 22, which remainwithin the normal magnetic field of the magnets 3 after the advancingportion 21 has traveled therebeyond, and by this means, the normal fieldis extended temporarily in the direction of rotation of the drum. Hence,the magnetzable objects will be carried by the advancing edge 21, andthe attraction of the body or bodies 16 for the magnetizable objectswill exist until the rearwardly extending portions 22- pass out of thenormal field of the magnet, whereupon the body or bodies 16 areinstantly demagnetized, and the loose objects heretofore carried by themagnetism thereof will yield tothe influence of gravity, and fall. Asherein shown, the

magnetizable bodies 16 are generally U- shaped in form, and theirterminal portions extend in a generally rearward directioncircumferentially along the surface of the drum, as clearly-shown inFig. 2.

The non-magnetizable materials, such for example as coal, will`naturally gravitate from the surface of the rotating drum, and

will fall into a suitable receptacle 23 provided therefor, saidreceptacle in the present instance being shown only partially, but inpractice will constitute the housing for the coal breaker. The latter inpractice usually comprises two or more crushing cylinders provided withsuitable teeth or other instrumentalities for crushing the large lumpsof coal. In practice, if bolts, spikes or other such objects come intocontact with these teeth, they are very apt to becomey broken, and thecrusher seriously damaged, but by the use of the described magneticseparator,

this danger is eliminated and the crusher protected from injury.

While I have herein shown and described one specific embodiment of myinvention for illustrative purposes, and have disclosed and discussed indetail the construction and arrangement incidental to one specificapplication thereof, it is to be understood that the invention islimited neither to the mere details or relative arrangement of parts,nor to its specific embodiment herein shown, but that extensivedeviations from the illustrated form or embodiment of the invention maybe made, without departing from the principles thereof. Having thusdescribed my invention, what I claim and desire by Letters Patent toprocure is:

l. A magnetic separator comprising, in combination, means for creating amagnetic field; means for causing the materials to pass within saidfield; and a movable magnetizable body having a path of movement intoand out of said field, said body having an advancing edge to engagemagnetizable objects within said field and having a receding rearportion which remains within the normal magnetic field after theadvancing portion has traveled therebeyond, whereby the magnetic fieldis temporarily enlarged by said body.

2. A magnetic separator comprising, in combination, means for creating amagnetic field; means for delivering the materials into said field;means having a traveling surface onto which the materials are delivered;`and a magnetizable body carried by said surface alternately into andout of said field, said body having an advancing edge to engagemagnetizable objects within said field and having a rear portion whichremains within the normal magnetic field after the advancing portion hastraveled therebeyond.

3. A magnetic separator comprising, in combination, means for creating amagnetic field; a rotating non-magnetic cylinder onto which thematerials are delivered; and a magnetizable body carried by saidcylinder into and out of said magnetic field, said body ,having agenerally' U-shaped form with its terminal portions extending in agenerally circumferential direction.

4. A magnetic separator comprising, in combination, means for creating amagnetic field; a rotating non-magnetic cylinder onto which thematerials are delivered; and a magnetizable body carried by saidcylinder into and out of said magnetic field, said body having agenerally U-shaped form with its terminal portions extending rearwardlyin a generally circumferential direction.

5. A magnetic separator comprising, in combination, means for creating amagnetic field; a rotating non-magnetic cylinder onto inemee which thematerials fare deliyered; and e ing s main bortibn 21 end an extension`22 10 magnetizable body carried by` said cylinder movable through theeld of said magnet.

- into and out of said magnetic field, .said 1n testimony whereof, Ihavesigned my bodyl having a portion extending along Aan' neme to thisspecification, in the presence of element of the cylinder and a,rearward extwo subscribing witnesses. y

tension therefrom. f HUBERT M. FOLSM.

6. A magnetic separator comprising,f in Witnesses:

combination, the magnet "3, the traveling Louis A. JONES,

surface 9 and thema'gnetizable' body -hav; CLARA L. STUART.

